I finally got my N2215 card today and want to share my experince.
@zeynel I can report that both brackets are included.
I checked the native firmware shortly. It seems to me that the only difference between the M1215 and the N2215 is the firmware which is already in IT-Mode for the N2215. Even though a pretty dated firmware from 2013 was installed. The last "official" update available is from 2014.
I crossflashed the card
@Rand.
I used
the guide from Patrick. I flashed the new firmware first with the Bios/Uefi files and afterwards without. Both times it worked without any problems and took 20 min at all. I will see how SMART etc. behaves when the card is passedthrough to FreeBSD. (Could take 2 or 3 weeks though, I have a lot of other stuff going on atm)
I really consider to drop my Dell H310 and get a second N2215 card... (crossflashing the Dell is a pain in the a.. compared to the N2215).
If there are any further questions feel free to ask.